screen saver

noun
  1. 1

    A computer program that displays aesthetic patterns or images when the computer is not being used, originally intended to prevent screenburn.

    I configured my screensaver to appear after only two minutes, because I enjoyed watching it so much.

  2. 2

    The background picture of a computer, smartphone, or similar mobile device.

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Source: https://en.wiktionary.org/wiki/screen%20saver, https://en.wiktionary.org/wiki/screensaver